Multiquip MQP60IV, MQP20IZ, MQP40IZ Electrical Terminations, Ac Electrical Connections, breaker

AC ELECTRICAL CONNECTIONS

Electrical Terminations

Most engine-generators, whether located indoor or outdoors are usually mounted on a concrete pad and typical electrical terminations are brought up underneath the engine-generator for final termination.This cable entry or “stub-up” underneath the generator set provides for easy termination of the feeder conductors and makes for a clean, professional looking installation. Check code compliance before proceeding.

a) Separately Mounted Fuel Tank - When a separately

mounted fuel tank is used, the electrical stub-up

underneath the generator set is simplified because of

the open bottom design of the generator skid. The final

cable terminations rise from the stub-up entry location

underneath the engine-generator, in a close proximity to

the circuit breaker enclosure.When code required, these

feeders should be provided in suitable and properly sized

conduits that attach to the circuit breaker enclosure.

The feeder cables then connect directly to the output

lugs and/or bus bars provided on the main line circuit

breaker.

b) Subbase Mounted Fuel Tank - When a subbase fuel

tank is used (refer to Fuel System section), the tank

should be designed with a stub-up area on the generator-

end of the tank. This feature allows for an open area on

the tank assembly whereby electrical terminations can

be brought up underneath the engine-generator for final

termination, just like the open bottom design generator

skid. (This feature is standard for all MQ Power subbase

tanks and is typically a purchasable option from most

If the engine-generator is fitted with a weatherproof outdoor enclosure, it may be required to penetrate the side of the generator housing to facilitate final cable terminations. This will likely require special conduit, fittings and hardware.The feeder conductors would enter the housing on the side where the circuit breaker is mounted. The feeder conductors would enter the circuit breaker enclosure from the bottom, top or side as necessary, to complete final cable terminations. Check with the local inspection authority before proceeding.

Closed Bottom Generator - If the engine-generator is closed bottom, such as in a sound attenuated design, the bottom floor of the engine-generator must be cut to allow for a bottom entry electrical stub-up. If this is not possible, it may be required to route the feeder conductors on the outside of the engine-generator to reach the circuit breaker enclosure.This will likely require special conduit, fittings and hardware. The feeder conductors would enter the housing on the side where the circuit breaker is mounted.The feeder conductors would enter the circuit breaker enclosure from the bottom, top or side as necessary, to complete final cable terminations. Check with the local inspection authority before proceeding.

Refer to National Electric Code (NEC)

NOTETable 210.24 for specific circuit breaker current ratings for various size conductors.

tank manufacturers) When code required, the feeder

conductors should be provided in suitable and properly

sized conduits that attach to the circuit breaker

enclosure. The feeder cables then connect directly to

the output lugs and/or bus bars provided on the main

line circuit breaker.

c) Oversize Subbase Tank - Specification requirements

NOTE

Refer to Table 25 “Main Line Circuit Breaker Sizing Information” on page 85 for a complete listing of MQ Power

generator main line circuit breakers available from the factory. This table details information about circuit breaker ampacity ratings, interrupt

sometimes require an oversized tank to meet specific

generator run-time demands. This can cause difficulty

in completing final electrical connections. The tank

should be designed with a stub-up area on the generator-

end of the tank. However, depending on the placement

of the engine-generator on the tank, feeder terminations

may not rise in a close proximity to the circuit breaker

enclosure. This could require the feeder conductors to

enter the circuit breaker enclosure from the side or top,

necessitating special fittings and/or hardware.

capacity, quantity of conductors per phase & size of output lugs available for each breaker, for each model MQ Power Standby Generators.

INDUSTRIAL GENERATOR SETS — APPLICATION & INSTALLATION MANUAL — REV. #4 (09/07/07) — PAGE 75